From 07c80b2164ef924bdd158144e21cf4c2b5f3d22d Mon Sep 17 00:00:00 2001
From: Marco Chen <marcochen@google.com>
Date: Mon, 21 Dec 2020 22:10:21 +0800
Subject: mb/google/octopus: add audio codec into SSFC support for Bobba

BUG=b:174118027
BRANCH=octopus
TEST=adjust SSFC value of CBI to select RT5682 or DA7219 then check
whether device tree is updated correspondingly by disabling unselected
one.

Signed-off-by: Marco Chen <marcochen@google.com>
Change-Id: Id37c4c5716ade0851cfcb24e12b390841e633ac9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48795
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Zhuohao Lee <zhuohao@chromium.org>
---
 src/mainboard/google/octopus/mainboard.c | 79 ++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

(limited to 'src/mainboard/google/octopus/mainboard.c')

diff --git a/src/mainboard/google/octopus/mainboard.c b/src/mainboard/google/octopus/mainboard.c
index e6dbd0330b..91d29cf61c 100644
--- a/src/mainboard/google/octopus/mainboard.c
+++ b/src/mainboard/google/octopus/mainboard.c
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <acpi/acpi.h>
+#include <baseboard/cbi_ssfc.h>
 #include <baseboard/variants.h>
 #include <boardid.h>
 #include <bootstate.h>
@@ -8,6 +9,7 @@
 #include <device/device.h>
 #include <device/pci_def.h>
 #include <device/pci_ops.h>
+#include <drivers/i2c/generic/chip.h>
 #include <ec/google/chromeec/ec.h>
 #include <ec/ec.h>
 #include <intelblocks/xhci.h>
@@ -22,6 +24,9 @@
 #include <variant/ec.h>
 #include <variant/gpio.h>
 
+extern struct chip_operations drivers_i2c_generic_ops;
+extern struct chip_operations drivers_i2c_da7219_ops;
+
 static bool is_cnvi_held_in_reset(void)
 {
 	struct device *dev = pcidev_path_on_root(PCH_DEVFN_CNVI);
@@ -46,6 +51,41 @@ static void disable_wifi_wake(void)
 	gpio_configure_pads(wifi_wake_gpio, ARRAY_SIZE(wifi_wake_gpio));
 }
 
+/*
+ * GPIO_137 for two audio codecs right now has the different configuration so
+ * if SSFC indicates that codec is different than default one then GPIO_137
+ * needs to be overridden for the corresponding second source.
+ */
+static void gpio_modification_by_ssfc(struct pad_config *table, size_t num)
+{
+	/* For RT5682, GPIO 137 should be set as EDGE_BOTH. */
+	const struct pad_config rt5682_gpio_137 = PAD_CFG_GPI_APIC_IOS(GPIO_137,
+			NONE, DEEP, EDGE_BOTH, INVERT, HIZCRx1, DISPUPD);
+
+	if (table == NULL || num == 0)
+		return;
+
+	/*
+	 * Currently we only have the case of RT5682 as the second source. And
+	 * in case of Ampton which used RT5682 as the default source, it didn't
+	 * provide override_table right now so it will be returned ealier since
+	 * table above is NULL.
+	 */
+	if (ssfc_get_audio_codec() != SSFC_AUDIO_CODEC_RT5682)
+		return;
+
+	while (num--) {
+		if (table->pad == GPIO_137) {
+			*table = rt5682_gpio_137;
+			printk(BIOS_INFO,
+				"Configure GPIO 137 based on SSFC.\n");
+			return;
+		}
+
+		table++;
+	}
+}
+
 static void mainboard_init(void *chip_info)
 {
 	int boardid;
@@ -58,6 +98,8 @@ static void mainboard_init(void *chip_info)
 
 	base_pads = variant_base_gpio_table(&base_num);
 	override_pads = variant_override_gpio_table(&override_num);
+	gpio_modification_by_ssfc((struct pad_config *)override_pads,
+			override_num);
 
 	gpio_configure_pads_with_override(base_pads, base_num,
 			override_pads, override_num);
@@ -128,10 +170,47 @@ static void wifi_device_update(void)
 		dev->enabled = 0;
 }
 
+/*
+ * Base on SSFC value in the CBI from EC to enable one of audio codec sources in
+ * the device tree.
+ */
+static void audio_codec_device_update(void)
+{
+	struct device *audio_dev = NULL;
+	struct bus *audio_i2c_bus =
+		pcidev_path_on_root(PCH_DEVFN_I2C5)->link_list;
+	enum ssfc_audio_codec codec = ssfc_get_audio_codec();
+
+	while ((audio_dev = dev_bus_each_child(audio_i2c_bus, audio_dev))) {
+		if (audio_dev->chip_info == NULL)
+			continue;
+
+		if ((audio_dev->chip_ops == &drivers_i2c_da7219_ops) &&
+			(codec == SSFC_AUDIO_CODEC_DA7219)) {
+			printk(BIOS_INFO, "enable DA7219.\n");
+			continue;
+		}
+
+		if ((audio_dev->chip_ops == &drivers_i2c_generic_ops) &&
+			(codec == SSFC_AUDIO_CODEC_RT5682)) {
+			struct drivers_i2c_generic_config *cfg =
+				audio_dev->chip_info;
+
+			if (cfg != NULL && !strcmp(cfg->hid, "10EC5682")) {
+				printk(BIOS_INFO, "enable RT5682.\n");
+				continue;
+			}
+		}
+
+		audio_dev->enabled = 0;
+	}
+}
+
 void mainboard_devtree_update(struct device *dev)
 {
 	/* Apply common devtree updates. */
 	wifi_device_update();
+	audio_codec_device_update();
 
 	/* Defer to variant for board-specific updates. */
 	variant_update_devtree(dev);
-- 
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